| http://www.w3.org/ns/prov#value | - gnating whether the bridge is not present or is present, Me is a Group IIIB, IVB, VB, or VIB metal, Q is a hydride, a halogen, an amide or a hydrocarbyl radical, each Q being the same or different, except only one Q can be hydride and a p is the valence of Me minus two.
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